external/libpcap 0.9.8upstream/0.9.8nougat-mr1-arc

1 files changed, 419 insertions, 0 deletions

diff --git a/pcap-snit.c b/pcap-snit.c
new file mode 100644
index 00000000..60abe644
--- /dev/null
+++ b/pcap-snit.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Modifications made to accommodate the new SunOS4.0 NIT facility by
+ * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989.
+ * This module now handles the STREAMS based NIT.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.72.2.1 2005/05/03 18:54:38 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/timeb.h>
+#include <sys/dir.h>
+#include <sys/fcntlcom.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/stropts.h>
+
+#include <net/if.h>
+#include <net/nit.h>
+#include <net/nit_if.h>
+#include <net/nit_pf.h>
+#include <net/nit_buf.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcpip.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "pcap-int.h"
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+/*
+ * The chunk size for NIT.  This is the amount of buffering
+ * done for read calls.
+ */
+#define CHUNKSIZE (2*1024)
+
+/*
+ * The total buffer space used by NIT.
+ */
+#define BUFSPACE (4*CHUNKSIZE)
+
+/* Forwards */
+static int nit_setflags(int, int, int, char *);
+
+static int
+pcap_stats_snit(pcap_t *p, struct pcap_stat *ps)
+{
+
+	/*
+	 * "ps_recv" counts packets handed to the filter, not packets
+	 * that passed the filter.  As filtering is done in userland,
+	 * this does not include packets dropped because we ran out
+	 * of buffer space.
+	 *
+	 * "ps_drop" counts packets dropped inside the "/dev/nit"
+	 * device because of flow control requirements or resource
+	 * exhaustion; it doesn't count packets dropped by the
+	 * interface driver, or packets dropped upstream.  As filtering
+	 * is done in userland, it counts packets regardless of whether
+	 * they would've passed the filter.
+	 *
+	 * These statistics don't include packets not yet read from the
+	 * kernel by libpcap or packets not yet read from libpcap by the
+	 * application.
+	 */
+	*ps = p->md.stat;
+	return (0);
+}
+
+static int
+pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+	register int cc, n;
+	register struct bpf_insn *fcode = p->fcode.bf_insns;
+	register u_char *bp, *cp, *ep;
+	register struct nit_bufhdr *hdrp;
+	register struct nit_iftime *ntp;
+	register struct nit_iflen *nlp;
+	register struct nit_ifdrops *ndp;
+	register int caplen;
+
+	cc = p->cc;
+	if (cc == 0) {
+		cc = read(p->fd, (char *)p->buffer, p->bufsize);
+		if (cc < 0) {
+			if (errno == EWOULDBLOCK)
+				return (0);
+			snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
+				pcap_strerror(errno));
+			return (-1);
+		}
+		bp = p->buffer;
+	} else
+		bp = p->bp;
+
+	/*
+	 * loop through each snapshot in the chunk
+	 */
+	n = 0;
+	ep = bp + cc;
+	while (bp < ep) {
+		/*
+		 * Has "pcap_breakloop()" been called?
+		 * If so, return immediately - if we haven't read any
+		 * packets, clear the flag and return -2 to indicate
+		 * that we were told to break out of the loop, otherwise
+		 * leave the flag set, so that the *next* call will break
+		 * out of the loop without having read any packets, and
+		 * return the number of packets we've processed so far.
+		 */
+		if (p->break_loop) {
+			if (n == 0) {
+				p->break_loop = 0;
+				return (-2);
+			} else {
+				p->bp = bp;
+				p->cc = ep - bp;
+				return (n);
+			}
+		}
+
+		++p->md.stat.ps_recv;
+		cp = bp;
+
+		/* get past NIT buffer  */
+		hdrp = (struct nit_bufhdr *)cp;
+		cp += sizeof(*hdrp);
+
+		/* get past NIT timer   */
+		ntp = (struct nit_iftime *)cp;
+		cp += sizeof(*ntp);
+
+		ndp = (struct nit_ifdrops *)cp;
+		p->md.stat.ps_drop = ndp->nh_drops;
+		cp += sizeof *ndp;
+
+		/* get past packet len  */
+		nlp = (struct nit_iflen *)cp;
+		cp += sizeof(*nlp);
+
+		/* next snapshot        */
+		bp += hdrp->nhb_totlen;
+
+		caplen = nlp->nh_pktlen;
+		if (caplen > p->snapshot)
+			caplen = p->snapshot;
+
+		if (bpf_filter(fcode, cp, nlp->nh_pktlen, caplen)) {
+			struct pcap_pkthdr h;
+			h.ts = ntp->nh_timestamp;
+			h.len = nlp->nh_pktlen;
+			h.caplen = caplen;
+			(*callback)(user, &h, cp);
+			if (++n >= cnt && cnt >= 0) {
+				p->cc = ep - bp;
+				p->bp = bp;
+				return (n);
+			}
+		}
+	}
+	p->cc = 0;
+	return (n);
+}
+
+static int
+pcap_inject_snit(pcap_t *p, const void *buf, size_t size)
+{
+	struct strbuf ctl, data;
+	
+	/*
+	 * XXX - can we just do
+	 *
+	ret = write(pd->f, buf, size);
+	 */
+	ctl.len = sizeof(*sa);	/* XXX - what was this? */
+	ctl.buf = (char *)sa;
+	data.buf = buf;
+	data.len = size;
+	ret = putmsg(p->fd, &ctl, &data);
+	if (ret == -1) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
+		    pcap_strerror(errno));
+		return (-1);
+	}
+	return (ret);
+}
+
+static int
+nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
+{
+	bpf_u_int32 flags;
+	struct strioctl si;
+	struct timeval timeout;
+
+	si.ic_timout = INFTIM;
+	if (to_ms != 0) {
+		timeout.tv_sec = to_ms / 1000;
+		timeout.tv_usec = (to_ms * 1000) % 1000000;
+		si.ic_cmd = NIOCSTIME;
+		si.ic_len = sizeof(timeout);
+		si.ic_dp = (char *)&timeout;
+		if (ioctl(fd, I_STR, (char *)&si) < 0) {
+			snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSTIME: %s",
+			    pcap_strerror(errno));
+			return (-1);
+		}
+	}
+	flags = NI_TIMESTAMP | NI_LEN | NI_DROPS;
+	if (promisc)
+		flags |= NI_PROMISC;
+	si.ic_cmd = NIOCSFLAGS;
+	si.ic_len = sizeof(flags);
+	si.ic_dp = (char *)&flags;
+	if (ioctl(fd, I_STR, (char *)&si) < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSFLAGS: %s",
+		    pcap_strerror(errno));
+		return (-1);
+	}
+	return (0);
+}
+
+pcap_t *
+pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
+    char *ebuf)
+{
+	struct strioctl si;		/* struct for ioctl() */
+	struct ifreq ifr;		/* interface request struct */
+	int chunksize = CHUNKSIZE;
+	int fd;
+	static char dev[] = "/dev/nit";
+	register pcap_t *p;
+
+	p = (pcap_t *)malloc(sizeof(*p));
+	if (p == NULL) {
+		strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+		return (NULL);
+	}
+
+	if (snaplen < 96)
+		/*
+		 * NIT requires a snapshot length of at least 96.
+		 */
+		snaplen = 96;
+
+	memset(p, 0, sizeof(*p));
+	/*
+	 * Initially try a read/write open (to allow the inject
+	 * method to work).  If that fails due to permission
+	 * issues, fall back to read-only.  This allows a
+	 * non-root user to be granted specific access to pcap
+	 * capabilities via file permissions.
+	 *
+	 * XXX - we should have an API that has a flag that
+	 * controls whether to open read-only or read-write,
+	 * so that denial of permission to send (or inability
+	 * to send, if sending packets isn't supported on
+	 * the device in question) can be indicated at open
+	 * time.
+	 */
+	p->fd = fd = open(dev, O_RDWR);
+	if (fd < 0 && errno == EACCES)
+		p->fd = fd = open(dev, O_RDONLY);
+	if (fd < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s", dev,
+		    pcap_strerror(errno));
+		goto bad;
+	}
+
+	/* arrange to get discrete messages from the STREAM and use NIT_BUF */
+	if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "I_SRDOPT: %s",
+		    pcap_strerror(errno));
+		goto bad;
+	}
+	if (ioctl(fd, I_PUSH, "nbuf") < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "push nbuf: %s",
+		    pcap_strerror(errno));
+		goto bad;
+	}
+	/* set the chunksize */
+	si.ic_cmd = NIOCSCHUNK;
+	si.ic_timout = INFTIM;
+	si.ic_len = sizeof(chunksize);
+	si.ic_dp = (char *)&chunksize;
+	if (ioctl(fd, I_STR, (char *)&si) < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSCHUNK: %s",
+		    pcap_strerror(errno));
+		goto bad;
+	}
+
+	/* request the interface */
+	strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
+	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
+	si.ic_cmd = NIOCBIND;
+	si.ic_len = sizeof(ifr);
+	si.ic_dp = (char *)&ifr;
+	if (ioctl(fd, I_STR, (char *)&si) < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCBIND: %s: %s",
+			ifr.ifr_name, pcap_strerror(errno));
+		goto bad;
+	}
+
+	/* set the snapshot length */
+	si.ic_cmd = NIOCSSNAP;
+	si.ic_len = sizeof(snaplen);
+	si.ic_dp = (char *)&snaplen;
+	if (ioctl(fd, I_STR, (char *)&si) < 0) {
+		snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSSNAP: %s",
+		    pcap_strerror(errno));
+		goto bad;
+	}
+	p->snapshot = snaplen;
+	if (nit_setflags(p->fd, promisc, to_ms, ebuf) < 0)
+		goto bad;
+
+	(void)ioctl(fd, I_FLUSH, (char *)FLUSHR);
+	/*
+	 * NIT supports only ethernets.
+	 */
+	p->linktype = DLT_EN10MB;
+
+	p->bufsize = BUFSPACE;
+	p->buffer = (u_char *)malloc(p->bufsize);
+	if (p->buffer == NULL) {
+		strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
+		goto bad;
+	}
+
+	/*
+	 * "p->fd" is an FD for a STREAMS device, so "select()" and
+	 * "poll()" should work on it.
+	 */
+	p->selectable_fd = p->fd;
+
+	/*
+	 * This is (presumably) a real Ethernet capture; give it a
+	 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
+	 * that an application can let you choose it, in case you're
+	 * capturing DOCSIS traffic that a Cisco Cable Modem
+	 * Termination System is putting out onto an Ethernet (it
+	 * doesn't put an Ethernet header onto the wire, it puts raw
+	 * DOCSIS frames out on the wire inside the low-level
+	 * Ethernet framing).
+	 */
+	p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
+	/*
+	 * If that fails, just leave the list empty.
+	 */
+	if (p->dlt_list != NULL) {
+		p->dlt_list[0] = DLT_EN10MB;
+		p->dlt_list[1] = DLT_DOCSIS;
+		p->dlt_count = 2;
+	}
+
+	p->read_op = pcap_read_snit;
+	p->inject_op = pcap_inject_snit;
+	p->setfilter_op = install_bpf_program;	/* no kernel filtering */
+	p->setdirection_op = NULL;	/* Not implemented. */
+	p->set_datalink_op = NULL;	/* can't change data link type */
+	p->getnonblock_op = pcap_getnonblock_fd;
+	p->setnonblock_op = pcap_setnonblock_fd;
+	p->stats_op = pcap_stats_snit;
+	p->close_op = pcap_close_common;
+
+	return (p);
+ bad:
+	if (fd >= 0)
+		close(fd);
+	free(p);
+	return (NULL);
+}
+
+int
+pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
+{
+	return (0);
+}